A noun + noun combination can have any semantic relationship between the two nouns. You can guess in many cases, but you can't predict for sure. Where a noun is derived from a verb, the noun before it is often the object of that verb: so crowd surveillance is surveillance of a crowd (it surveys a crowd). However, security surveillance makes perfect sense as surveillance for security. And, to complicate it, police surveillance is surveillance by police.

As entangledbank points out, the relation between the two nouns can be various.
At the school in my neighborhood there are signs to direct the traffic of cars in which parents bring their children to school every day (yes!),
and pick them up to go home in the afternoon.
One sign says "Parent Drop-Off" and the other says "Student Pick-Up". There is no good reason why they disagree.
(The parent drops off the student in the morning and picks up the student in the afternoon.)

Regardless of grammar, I like your improvement on the word choices: "for security purposes".
The word "security" makes many people feel safer, but the word "surveillance" makes many people feel that their privacy is being invaded.